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US Patent: 1,407,578
Wrench
Self Adjustable Wrench
Patentee:
Frederic P. Robert - Lynnbrook, L.I., NY

USPTO Classifications:
81/117

Tool Categories:
wrenches : wrench adjustment types : self-adjust wrenches

Assignees:
None

Manufacturer:
Hoe Corporation - Poughkeepsie, NY
Robert Wrench Co. - New York, NY

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 02, 1921
Granted: Feb. 21, 1922

Patent Pictures: [ 1 | 2 ]
Frederic P. Robert patented February 21, 1922
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Description:
The wrench consists of a fixed jaw with a curved face, a movable jaw at an oblique angle, linkage between the two which keeps the gripping surface of the movable jaw approximately parallel to the curved fixed jaw, and a contractile spring in the linkage which tends to close the jaws.

Initially produced by the inventor; most of those found were produced by the Hoe Corporation and incorporate refinements from patent nos. 1,515,618 and 1,681,184.

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